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In high-flow water supply and heavy industrial fluid handling, the 43mm shaft diameter is the standard specification for the larger Grundfos vertical multistage pump ranges, specifically the CR32, CR45, CR64, and CR90 series. Given that these pumps are typically equipped with high-power motors (up to 45kW and above), the mechanical seal must maintain absolute integrity under high torque, extreme axial thrust, and severe pressure fluctuations.
Our 43mm Cartridge Seal is engineered as a premium alternative to the original HQQE/HQQV series. Featuring a hydraulically balanced architecture, it is capable of sustaining operating pressures up to 30 bar. Unlike traditional component-style seals, this cartridge design eliminates installation errors and protects expensive pump shafts via an integrated sleeve, serving as a mission-critical upgrade to improve your system's Mean Time Between Failure (MTBF).
Technical Matrix (43mm Series)
Parameter
Specifications
Engineering Insights
Bore/Shaft Size
43mm
Optimized for CR32 / 45 / 64 / 90 series
Max Operating Pressure
≤ 30 bar (435 psi)
Balanced design to reduce face loading
Temperature Range
-30°C to +120°C (Std)
Custom versions up to +180°C available
Velocity Limit
≤ 25 m/s
Suited for high-peripheral speed applications
Seal Face Materials
SiC / Tungsten Carbide (TC)
Superior thermal conductivity to prevent heat checking
Secondary Seals
EPDM (HQQE) / Viton (HQQV)
Optimized for chemical and thermal compatibility
Structural Metal
AISI 316 Stainless Steel
Enhanced resistance to pitting and crevice corrosion
Professional Analysis: Why 43mm Requires Specialized Cartridge Engineering
High-Torque Transmission Stability: Pumps in the 43mm bracket generate immense starting torque. Our seals feature reinforced drive lugs. The torque is transmitted through the rigid metal sleeve rather than the elastomer, preventing catastrophic rubber bellows shear during rapid motor ramp-up.
Hydraulic Balancing Technology: At larger shaft diameters, the closing force exerted by hydraulic pressure can be overwhelming. A non-balanced seal would suffer from rapid wear due to excessive face friction. Our balanced 43mm design optimizes the pressure-area ratio, ensuring a stable, micron-thick lubricating film even under high-head conditions.
Shaft Protection & Longevity: Replacing a 43mm Grundfos pump shaft is a high-cost operation. The cartridge unit incorporates an internal stainless steel sleeve; all O-ring movement occurs against the sleeve rather than the shaft, effectively eliminating shaft scoring and fretting corrosion.
Standardized Coding Compliance:
HQQE (EPDM): Recommended for boiler feed water and municipal supply where resistance to hot water and sterilization chemicals is required.
HQQV (Viton/FKM): Essential for industrial cooling, process water with chemical additives, or any media containing hydrocarbons.
Expert Q&A & Maintenance Insights
Q: Why are 43mm seals more prone to "Heat Checking" than smaller sizes?
A: As the shaft diameter increases, the peripheral velocity at the seal faces rises sharply, generating significant frictional heat. We utilize Reaction Bonded Silicon Carbide (RBSiC) for our 43mm faces, which provides the high thermal conductivity necessary to dissipate heat and prevent thermal stress cracking.
Q: What is the most critical step when installing a 43mm Cartridge Seal?
A: The management of the assembly spacers (set plates). You must tighten all grub screws (set screws) to the shaft before removing the set plates. For a 43mm shaft, even a slight axial misalignment will alter the spring pre-load, leading to premature leakage or face instability.
Q: Can I order based on Grundfos Part Numbers?
A: Yes. Our 43mm units are direct replacements for common OEM numbers such as 96531299 (HQQE) and 96531300 (HQQV), ensuring a seamless fit-and-function match.
Q: How do I determine if an upgrade to Viton (HQQV) is necessary?
A: If your process media contains trace oils, cleaning agents, or if the water temperature fluctuates with organic content, Viton is the safer choice due to its broader chemical resistance profile compared to EPDM.
Product Advantages
Spring unit averted from the product so no sticking and clogging of the springs
Safe operation (no fractures) because of seal face locking by square pin
Suitable for pressure reversals
Operation in vacuum without additional seat locking possible
No damage of the shaft by a dynamically loaded O-Ring
Small installation sizes
Best suitable for conversions, no adaptations of the pump
Insensitive to solid containing and abrasive media
Advantages of a balanced seal even with plain shafts
Insensitive to shaft movements because of the stationary design
Application Areas
Water and waste water technology
Chemical industry
Refining technology
Dirty, abrasive and solid containing media
Fugitive hydrocarbons (no API seal!)
Sticky and stringy media
Chemical standard pumps
Sewage pumps
Shipping & Payment Terms
Port of Loading: Shanghai
Shipping Method: DHL, UPS, FEDEX, TNT, etc
Payment Terms: T/T, Western Union, MoneyGram
Our Services
OEM/ODM orders are available for our factory
Accept customized mechanical seals according to your drawing or requirements
Small quantity is accepted
Provides excellent quality with competitive price
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Trading Company,Seller
Year Established:
1992
Total Annual:
10milion-15milion
Employee Number:
80~100
Ecer Certification：
Verified Supplier
JIAXING BURGMANN is a professional manufacturer of mechanical seal for pump and autoclave used in the mining, industry, agriculture, flange, rubber ring, bushing, hard alloy and Sic. We are specialized in producing Burgmann series seals.
We have over 20 years production experience, wit... JIAXING BURGMANN is a professional manufacturer of mechanical seal for pump and autoclave used in the mining, industry, agriculture, flange, rubber ring, bushing, hard alloy and Sic. We are specialized in producing Burgmann series seals.
We have over 20 years production experience, wit...
